HOWTO - Check to see if File is Image

check_if_file_is_image.py

#!/usr/bin/env python3
#
# http://www.blog.pythonlibrary.org/2020/02/09/how-to-check-if-a-file-is-a-valid-image-with-python/
#
import imghdr          # for imghdr
from PIL import Image  # for Image.open

path = 'python.jpg'
imghdr.what(path)
# returns 'jpeg'

path = 'python.png'
imghdr.what(path)
# returns 'png'

img = Image.open('all_python.jpg')
img.format
# returns 'JPEG'

Be careful! This code only detects the following image formats:
rgb, gif, pbm, pgm, ppm, tiff, rast, xbm, jpeg, bmp, png, webp, exr
See the answers for this question: https://stackoverflow.com/questions/889333/how-to-check-if-a-file-is-a-valid-image-file